<template>
	<view>
		<!-- 向组件传入自定义事件，不是原生的click事件 -->
		<my-search @click=gotoSearch></my-search>
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view scroll-y="true" :style="{height:wh+'px'}" class="left-scroll-view">
				<block v-for="(item,i) in cateList" :key="item.cat_id">
					<view :class="['left-scroll-view-item',i==active?'active':'']" @click="activeChange(i)">
						{{item.cat_name}}
					</view>
				</block>

			</scroll-view>
			<!-- 右侧滑动区域 -->
			<scroll-view scroll-y="true" :style="{height:wh+'px'}" class="right-scroll-view" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">{{item2.cat_name}}</view>
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3"
							@click="gotoGoodsList(item3)">
							<!-- 图片 -->
							<image :src="item3.cat_icon.replace('dev','web')" mode="widthFix" />
							</image>
							<!-- 文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				//屏幕可用高度
				wh: 0,
				//左侧列表数据
				cateList: [],
				// 标记左侧被选项，增加active样式
				active: 0,
				//二级分类
				cateLevel2: [],
				//滚动条距离顶部位置的距离
				scrollTop: 0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			// 为 wh 窗口可用高度动态赋值
			this.wh = sysInfo.windowHeight-30
			//调用获取左侧列表数据的方法
			this.getCateList()

		},
		methods: {
			//获取左侧列表的数据
			async getCateList() {
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status !== 200) return uni.showMsg()
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children
			},
			activeChange(i) {
				this.active = i
				this.cateLevel2 = this.cateList[i].children
				this.scrollTop = this.scrollTop ? 0 : 1
			},
			gotoGoodsList(item3) {
				uni.navigateTo({
					url: '../../subpkg/goods-list/goods-list?cid=' + item3.cat_id
				})
				
			},
			gotoSearch(){
			    uni.navigateTo({
			    	url:'../../subpkg/search/search'
			    })
			},
		},
		
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-scroll-view {
			width: 120px;

			//左侧滚动条的样式
			.left-scroll-view-item {
				line-height: 60px;
				background-color: #f7f7f7;
				text-align: center;
				font-size: 12px;

				&.active {
					background-color: #FFFFFF;
					position: relative;

					&::before {
						content: ' ';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #c00000;
						position: absolute;
						left: 0;
						top: 50%;
						transform: translateY(-50%);
					}
				}

			}

			//右侧滚动条的样式

		}
	}

	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}

	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;
	}

	.cate-lv3-item {
		width: 33.3%;
		display: flex;
		flex-direction: column;
		align-items: center;

		margin-bottom: 10px;

		image {
			width: 60px;
			height: 60px;
		}

		font-size: 12px;
	}
</style>
